JPH101940A - Soil improvement material and method of vibration-isolation soil improvement construction using soil improvement material thereof - Google Patents
Soil improvement material and method of vibration-isolation soil improvement construction using soil improvement material thereofInfo
- Publication number
- JPH101940A JPH101940A JP17739496A JP17739496A JPH101940A JP H101940 A JPH101940 A JP H101940A JP 17739496 A JP17739496 A JP 17739496A JP 17739496 A JP17739496 A JP 17739496A JP H101940 A JPH101940 A JP H101940A
- Authority
- JP
- Japan
- Prior art keywords
- ground improvement
- ground
- soil improvement
- improvement material
- cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、免震性又は防震性
に優れた地盤改良体を造成するための地盤改良材及びこ
れを用いた工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground improvement material for constructing a ground improvement material having excellent seismic isolation or anti-seismic property and a method of using the same.
【０００２】[0002]
【従来の技術】従来、地震に対する地盤を強化するため
に固結工法が広く利用されている。一般的な固結工法を
概略的に述べると、先ず、掘削装置により対象地盤を一
定深度まで削孔し、続いてこの削孔内に注入ロッドを挿
入しこれを上下に移動させながら所望の位置にて注入ロ
ッドに設けられた噴射口より硬化薬液（例えば、セメン
ト系又は石灰系）を噴射して対象地盤と混合もしくは浸
透させ、目的とする強固な地盤改良体を地中に形成する
ものである。この結果、対象地盤の圧縮強度又は粘着力
が増強される。また、砂質土等の液状化しやすい軟弱地
盤に対する地震対策においても、この工法を用いて地盤
を固結することにより粘着力を増強して液状化を防ぐこ
とが行われている。2. Description of the Related Art Conventionally, a consolidation method has been widely used to strengthen the ground against earthquakes. The general consolidation method is described as follows: first, the target ground is drilled to a certain depth by the excavator, then the injection rod is inserted into this hole and the desired position is moved up and down. Injecting a hardening chemical (for example, cement or lime) from the injection port provided in the injection rod to mix or permeate with the target ground, thereby forming the intended strong ground improvement body in the ground is there. As a result, the compressive strength or adhesive strength of the target ground is enhanced. Further, also in earthquake countermeasures against soft ground such as sandy soil that is likely to be liquefied, liquefaction is prevented by strengthening the adhesive force by consolidating the ground using this method.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、昨今注
目されている建築物における免震構造では、徒に構造体
自体を堅固とするよりは、むしろ地震動のエネルギーを
効率よく吸収させることにより構造体への影響を少なく
しようとする手段が採られている。これに対し、構造体
自体の強度を増強する手段においては、その改良部分が
共振する可能性もありかえって逆効果となるおそれがあ
る。すなわち、軟弱地盤を固結して強化する従来の工法
では、大きな地震動に耐えられないのみでなく地震動を
増幅してしまうことさえ有り得る。また、地盤を強化す
る従来工法では地震による影響を防止するために広範囲
の地盤改良が必要となり、特に既設建造物周辺では地盤
改良範囲を確保することが困難である。However, in the seismic isolation structure of a building which has been attracting attention recently, it is possible to efficiently absorb the energy of seismic motion to the structure rather than making the structure itself rigid. Measures are taken to reduce the effects of On the other hand, in the means for increasing the strength of the structure itself, there is a possibility that the improved portion may resonate, which may have the opposite effect. That is, the conventional construction method of consolidating and strengthening soft ground not only cannot withstand a large earthquake motion, but can even amplify the earthquake motion. Further, the conventional method of strengthening the ground requires extensive ground improvement in order to prevent the effects of earthquakes, and it is difficult to secure the ground improvement range especially in the vicinity of existing buildings.
【０００４】以上のような耐震性に関する思想及び地盤
改良工法の施工性に鑑み、本発明は、対象地盤に対して
有効な免震性を有する地盤改良体を造成するための地盤
改良材及びこれを用いた工法を提供することを目的とす
る。In view of the above-mentioned idea regarding earthquake resistance and the workability of the ground improvement method, the present invention provides a ground improvement material and a ground improvement material for forming a ground improvement body having effective seismic isolation for the target ground. It is an object to provide a construction method using the method.
【０００５】[0005]
【課題を解決するための手段】上記の目的を達成するべ
く本発明は以下の構成を提供する。本発明による地盤改
良材の第１の態様は、免震性の地盤改良体を造成するた
めに使用する地盤改良材であって、少なくともゴム砕片
を含む分散材と、該分散材を分散させかつ固結させるバ
インド材とを含む。In order to achieve the above object, the present invention provides the following arrangement. A first aspect of a ground improvement material according to the present invention is a ground improvement material used for constructing a seismic isolated ground improvement body, the dispersion material containing at least rubber fragments, and the dispersion material dispersed therein. Including a binding material to be solidified.
【０００６】本発明による地盤改良材の第２の態様は、
上記第１の態様において、前記分散材がさらに合成樹脂
砕片を含む。A second aspect of the ground improvement material according to the present invention is as follows.
In the first aspect, the dispersant further includes synthetic resin fragments.
【０００７】本発明による地盤改良材の第３の態様は、
上記第１又は第２の態様において、前記分散材が粉砕に
より形成されかつその大きさが粒径０．５〜９．０ｍｍ
である。A third aspect of the ground improvement material according to the present invention is
In the first or second aspect, the dispersion material is formed by pulverization and has a size of 0.5 to 9.0 mm.
It is.
【０００８】本発明による地盤改良材の第４の態様は、
上記第１〜第３の態様のいずれかにおいて、前記バイン
ド材がセメント又はセメント系硬化材のいずれかと水と
を含む。A fourth aspect of the ground improvement material according to the present invention is
In any one of the first to third aspects, the binding material contains either cement or a cement-based hardening material and water.
【０００９】本発明による地盤改良材の第５の態様は、
上記第４の態様において、前記バインド材がさらにケイ
酸ソ−ダを含む。A fifth aspect of the ground improvement material according to the present invention is
In the fourth aspect, the binding material further contains soda silicate.
【００１０】本発明による地盤改良材の第６の態様は、
上記第４又は第１の携帯用ユニット５の態様において、
前記バインド材がセメントと水とを含む場合に、前記分
散材と該セメントと該水との配合における重量比が１．
０：０．３〜２．０：０．３〜２．０である。A sixth aspect of the ground improvement material according to the present invention is
In the aspect of the fourth or first portable unit 5,
When the binding material contains cement and water, the weight ratio of the dispersing material, the cement and the water in the mixture is 1.
0: 0.3 to 2.0: 0.3 to 2.0.
【００１１】本発明による地盤改良材の第７の態様は、
上記第１〜第３の態様のいずれかにおいて、前記バイン
ド材が樹脂を含む。A seventh aspect of the ground improvement material according to the present invention is as follows.
In any one of the first to third aspects, the binding material contains a resin.
【００１２】本発明による免震性地盤改良工法の一態様
は、掘削、撹拌及び流動体吐出の機能を有するロッド体
を具備する地盤改良装置を用いて地盤に対して空洞を形
成し、該空洞内に上記第１〜７のいずれかの態様の地盤
改良材を吐出充填することにより柔軟な地盤改良体を造
成するものである。One embodiment of the seismic isolation ground improvement method according to the present invention is to form a cavity in the ground by using a ground improvement device having a rod body having functions of excavation, agitation, and fluid discharge. A flexible ground improvement body is formed by discharging and filling the ground improvement material according to any one of the first to seventh aspects.
【００１３】本発明による免震性地盤改良工法の別の態
様は、掘削、撹拌及び流動体吐出の機能を有するロッド
体を具備する地盤改良装置を用いて地盤に対して削孔を
形成し、該削孔の周辺地盤に対して請求項１〜７のいず
れかに記載の地盤改良材を浸透混合させることにより柔
軟な地盤改良体を造成することを特徴とする。Another aspect of the seismic isolation ground improvement method according to the present invention is to form a hole in the ground using a ground improvement device having a rod body having functions of excavation, agitation, and fluid discharge. A flexible ground improvement body is formed by infiltrating and mixing the ground improvement material according to any one of claims 1 to 7 into the ground around the drilled hole.
【００１４】[0014]
【作用】本発明による地盤改良材を用いて対象地盤中に
形成される地盤改良体は、低強度ではあるが柔軟性のあ
る構造体であり、地中を伝搬する地震動のエネルギーを
吸収しまた減衰させる作用をもつ。The ground improvement body formed in the target ground using the ground improvement material according to the present invention is a flexible structure having low strength but absorbing the energy of seismic motion propagating in the ground. Has a damping effect.
【００１５】本発明による地盤改良材を用いた地盤改良
体を、保護しようとする建造物の周囲の地盤中に適宜配
置することにより、地震動が当該建造物に及ぼす衝撃を
低減することができる。By appropriately disposing the ground improvement body using the ground improvement material according to the present invention in the ground around the building to be protected, it is possible to reduce the impact of earthquake motion on the building.
【００１６】[0016]
【発明の実施の形態】以下、図面を参照して本発明を詳
細に説明する。本発明による地盤改良材は、媒体である
バインド材とこのバインド材に分散される分散材とから
構成される。このバインド材と分散材とからなる地盤改
良材は、施工時には流動体であって適宜の液体搬送装置
により送出可能でありかつ任意形状の空隙に対して充填
もしくは地盤と混合することが可能であり、かつ施工後
には固化して地盤改良体を形成するものである。また分
散材とバインド材とを別々に施工することも可能であ
る。すなわち先ず分散材のみを地盤中に送出施工した後
バインド材を分散材の間隙に充填することにより、施工
後にバインド材が固結して地盤改良体を形成する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. The ground improvement material according to the present invention includes a binding material as a medium and a dispersing material dispersed in the binding material. The ground improvement material consisting of the binding material and the dispersion material is a fluid at the time of construction and can be delivered by an appropriate liquid transfer device, and can be filled into the voids of any shape or mixed with the ground. And, after construction, it solidifies to form a ground improvement body. It is also possible to separately construct the dispersing material and the binding material. That is, first, only the dispersing material is delivered into the ground, and then the binding material is filled in the gap between the dispersing materials. After the application, the binding material is solidified to form a ground improvement body.
【００１７】バインド材としては、例えば、セメント、
セメント系硬化材、又は樹脂のうちいずれか又はこれら
の任意の組合せを用いることができる。さらにケイ酸ソ
ーダを含めてもよい。またバインド材は適宜水を含んで
もよい。バインド材として樹脂を用いる場合は接合材と
しての機能を有するものを用いる。例えば、２液混合型
の接着剤を混合させて固結させる。具体例としてはエポ
キシ樹脂が挙げられる。セメントのバインド材と比較し
て質が細かく低粘性であることから小さなクラックへも
浸透しやすく充填が可能である。Examples of the binding material include cement,
Any of cement-based hardeners, resins, or any combination thereof can be used. Further, sodium silicate may be included. Further, the binding material may appropriately contain water. When a resin is used as the binding material, one having a function as a bonding material is used. For example, a two-liquid mixed type adhesive is mixed and solidified. A specific example is an epoxy resin. Compared to the cement binding material, it is finer and has lower viscosity, so it can easily penetrate into small cracks and can be filled.
【００１８】分散材としては、主としてゴム及び合成樹
脂の双方又はいずれか一方の粉砕物すなわち砕片を用い
る。例えば、ゴム砕片の場合は、天然ゴム（ＮＲ）、ス
チレン・ブタジエンゴム（ＳＢＲ）、ブタジエンゴム
（ＢＲ）を含むタイヤ粉砕物及びＮＲ、ＳＢＲ、ＢＲ、
エチレン・プロビレンゴム（ＥＰＤＭ）を含む加硫ゴム
の粉砕物が好適である。合成樹脂砕片の場合は、可塑化
ポリ塩化ビニル（ＰＶＣ）、ポリプロピレン（ＰＰ）、
ポリエチレン（ＰＥ）等を主成分とする熱可塑性エラス
トマーの粉砕物が好適である。このように、本発明の地
盤改良材の分散材は、ゴム砕片の場合はタイヤを、合成
樹脂砕片の場合はバンパー等を粉砕して利用することが
でき、すなわち自動車等の廃棄物を再利用することがで
きる。As the dispersant, a crushed product, that is, a crushed product of rubber and / or synthetic resin is mainly used. For example, in the case of rubber fragments, crushed tires containing natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR) and NR, SBR, BR,
A pulverized product of a vulcanized rubber containing ethylene-propylene rubber (EPDM) is suitable. In the case of synthetic resin fragments, plasticized polyvinyl chloride (PVC), polypropylene (PP),
A pulverized product of a thermoplastic elastomer containing polyethylene (PE) as a main component is suitable. As described above, the dispersion material of the ground improvement material of the present invention can be used by crushing a tire in the case of rubber crushed pieces and a bumper or the like in the case of synthetic resin crushed pieces, that is, reusing waste such as automobiles. can do.
【００１９】図１は、分散されたゴム砕片及び／又は合
成樹脂砕片４４とバインダ材４６とを含む本発明による
地盤改良材が固化した地盤改良体４２の断面の様子を示
す図である。図示の例における本発明による地盤改良材
から形成された地盤改良体の内部では、微細な分散材砕
片が互いに接して団塊となったり連結されたりすること
により、地盤改良体全体に亘ってゴム材もしくは合成樹
脂材による網目状構造が形成されている。個々のゴム砕
片又は合成樹脂砕片は、形状が不規則であり異方性に富
み、また表面の凹凸が多く表面積が大きいのでこのよう
な構造を実現するのに最適である。こうして地盤改良体
が全体として弾性を有する柔軟な構造体となる。尚、適
用状況に応じて地盤改良体の弾性を調整するために、バ
インド材に対する分散材すなわちゴム砕片又は合成樹脂
砕片の配合割合は適宜選択される。好ましい分散状態
は、ゴム砕片又は合成樹脂砕片がバインド材中に均一に
分散し、かつゴム砕片又は合成樹脂砕片とバインド材と
の間に空隙のない状態である。FIG. 1 is a diagram showing a cross section of a ground improvement body 42 in which a ground improvement material according to the present invention including dispersed rubber fragments and / or synthetic resin fragments 44 and a binder material 46 is solidified. In the inside of the ground improvement body formed from the ground improvement material according to the present invention in the illustrated example, the fine dispersant material fragments are in contact with each other to form a nodule or are connected to each other, so that the rubber material is spread over the whole ground improvement material Alternatively, a network structure made of a synthetic resin material is formed. The individual rubber fragments or synthetic resin fragments are irregular in shape and rich in anisotropy, and have many surface irregularities and a large surface area, and therefore are optimal for realizing such a structure. Thus, the ground improvement body becomes a flexible structure having elasticity as a whole. In addition, in order to adjust the elasticity of the ground improvement body according to the application situation, the mixing ratio of the dispersing material, that is, the rubber crushed pieces or the synthetic resin crushed pieces to the binding material is appropriately selected. A preferable dispersed state is a state in which the rubber crushed pieces or the synthetic resin crushed pieces are uniformly dispersed in the binding material, and there is no void between the rubber crushed pieces or the synthetic resin crushed pieces and the binding material.
【００２０】本発明で用いるゴム砕片又は合成樹脂砕片
は、その作製方法に起因して必然的に大きさに分布があ
るが、分散材として配合される全砕片の９０％以上の砕
片の直径(これを便宜上「分散材の粒径」と称する)が
０．５〜９．０ｍｍの範囲内にある場合が好適である。
試験結果からは粒径が約２．０ｍｍ以下が最適であっ
た。もちろん１個の砕片は厳密な球形ではないが、ここ
でいう直径とは１つの砕片における平均的な差渡し長さ
を意味する。The rubber crushed pieces or synthetic resin crushed pieces used in the present invention necessarily have a size distribution due to the production method, but 90% or more of the diameter of the crushed pieces ( This is referred to as "dispersion material particle size" for the sake of convenience) in the range of 0.5 to 9.0 mm.
From the test results, the optimum particle size is about 2.0 mm or less. Of course, a single fragment is not exactly spherical, but the diameter as used herein means an average span length in one fragment.
【００２１】本発明による地盤改良材の実施形態の好適
例として、バインド材がセメントと水とを含む場合に、
ゴム砕片及び／又は合成樹脂砕片を含む分散材と、セメ
ントと、水との配合割合が重量比にして１．０：０．３
〜０．７：０．３〜０．７となるものが挙げられる。特
に重量比が１．０：０．５：０．５となるものが最適で
ある。As a preferred example of the embodiment of the soil improvement material according to the present invention, when the binding material contains cement and water,
The weight ratio of the dispersant containing the rubber fragments and / or the synthetic resin fragments, cement, and water is 1.0: 0.3.
~ 0.7: 0.3 to 0.7 can be mentioned. Particularly, the one having a weight ratio of 1.0: 0.5: 0.5 is most suitable.
【００２２】図２は、本発明による地盤改良材を対象地
盤に適用し、免震性の地盤改良体を造成する充填方式に
よる工法の例を示す図である。FIG. 2 is a view showing an example of a construction method by a filling method in which a ground improvement material according to the present invention is applied to a target ground to form a seismic isolation ground improvement body.
【００２３】図２（Ａ）では、一般的に地盤改良工法に
おいて用いられるものとほぼ同様の一式の装置が示され
ている。主要な構成要素としては、対象地盤に対して削
孔及び撹拌を行うロッド体１２、ロッド体１２又はその
先端の掘削翼１６若しくは撹拌翼１４等を回転させるモ
ータ１８、及びモータ駆動装置２０がある。ロッド体１
２は、削孔と撹拌専用のものでもよいが、好適にはその
内部に流体を搬送する適宜の管を具備して先端部から流
体を吐出することができるものを用いる。このような流
体吐出機能を有する削孔ロッドの場合は、後述するよう
に削孔に続いてロッド体を引き上げながら流体吐出が可
能であるが、流体吐出機能がない削孔ロッドの場合は、
削孔後、削孔ロッドを引き抜き、改めて流体吐出用ロッ
ドを挿入する必要がある。FIG. 2 (A) shows a set of devices generally similar to those used in the ground improvement method. The main components include a rod body 12 that drills and stirs the target ground, a motor 18 that rotates the rod body 12 or the excavation blade 16 or the stirring blade 14 at its tip, and a motor drive device 20. . Rod body 1
2 may be dedicated to drilling and agitation, but preferably is provided with an appropriate tube for transporting the fluid therein so that the fluid can be discharged from the tip. In the case of a drilling rod having such a fluid discharge function, it is possible to discharge fluid while pulling up the rod body following drilling as described later, but in the case of a drilling rod without a fluid discharge function,
After drilling, it is necessary to pull out the drilled rod and insert the fluid discharge rod again.
【００２４】図２（Ｂ）は空洞形成工程を示す。この工
程は、通常の薬液噴射工法においては削孔工程に相当す
る。しかしながら、通常の薬液噴射工法では最終的に削
孔の周囲地盤に地盤改良体が造成されることになるが、
本発明による地盤改良工法においては、この空洞５０の
内部に地盤改良体が造成されることになる（図２（Ｄ）
参照）。従って本発明では、薬液噴射工法における削孔
と区別する意味でこの図２（Ｂ）の工程で形成される孔
を特に「空洞」と称している。図２の工法の場合この空
洞５０の径が、造成される地盤改良体の径となる。空洞
５０の形成工程は、通常、高圧水を噴射しつつ進めら
れ、余剰の水や土砂はロッド体１２と空洞５０の内壁と
の間隙から地上へと排出される。図２（Ｃ）は、ロッド
体１２が予定の最下端３４へ到達して空洞５０の形成が
完了した状態を示す。FIG. 2B shows a cavity forming step. This step corresponds to a drilling step in a normal chemical liquid injection method. However, in the ordinary chemical solution injection method, the ground improvement body will eventually be created in the ground around the drilled hole,
In the ground improvement method according to the present invention, a ground improvement body is created inside the hollow 50 (FIG. 2 (D)).
reference). Therefore, in the present invention, the hole formed in the step of FIG. 2B is particularly referred to as a “cavity” in order to distinguish the hole from the hole in the chemical liquid injection method. In the case of the construction method of FIG. 2, the diameter of this cavity 50 becomes the diameter of the ground improvement body to be constructed. The process of forming the cavity 50 is normally performed while spraying high-pressure water, and surplus water and earth and sand are discharged to the ground from a gap between the rod body 12 and the inner wall of the cavity 50. FIG. 2C shows a state in which the rod body 12 reaches the planned lowermost end 34 and the formation of the cavity 50 is completed.
【００２５】その後、図２（Ｄ）に示すように、ロッド
体１２を引き上げつつその先端部の吐出口（図示せず）
から本発明による地盤改良体４２（予めバインド材と分
散材とを混合したもの）を吐出し、空洞５０内を当該地
盤改良体４２で充填する。通常は、地上までではなく適
宜の深さ３２まで充填して終了する。ロッド体１２を引
き上げるときも、撹拌翼１４等を回転させることによ
り、地盤改良材中のゴム砕片等の分散材が均一に分散さ
れるように撹拌しながら引き上げてもよい。このように
して地盤改良体４２が対象地盤中に形成される。Thereafter, as shown in FIG. 2 (D), the rod body 12 is pulled up, and a discharge port (not shown) at the tip end portion of the rod body 12 is pulled up.
, A ground improvement body 42 (a mixture of a binding material and a dispersion material in advance) according to the present invention is discharged, and the inside of the cavity 50 is filled with the ground improvement body 42. Normally, the process is completed by filling up to an appropriate depth 32 instead of reaching the ground. When the rod body 12 is pulled up, the stirring member 14 or the like may be rotated so that the dispersion material such as the rubber flakes in the ground improvement material is stirred and dispersed so as to be uniformly dispersed. Thus, the ground improvement body 42 is formed in the target ground.
【００２６】図２（Ｄ）の工程において別の充填方法を
とることもできる。この場合は、予めバインド材と分散
材とを混合しない。先ずゴム砕片及び／又は合成樹脂砕
片からなる分散材のみを空洞５０へ投入し、その後バイ
ンド材４６を充填かつ撹拌しつつロッド体を引き上げ
る。この方法によれば、施工前に予めバインド材と分散
材とを混合する工程を省略することができる上、ロッド
体の吐出機構にとっても分散材を含まないバインド材の
みを吐出する方が容易でありかつ負担が少ない。Another filling method may be adopted in the step of FIG. In this case, the binding material and the dispersing material are not mixed in advance. First, only the dispersing material composed of rubber crushed pieces and / or synthetic resin crushed pieces is put into the cavity 50, and then the rod body is pulled up while filling and agitating the binding material 46. According to this method, it is possible to omit the step of mixing the binding material and the dispersion material in advance before construction, and it is easier for the ejection mechanism of the rod body to discharge only the binding material without the dispersion material. Yes and less burdensome.
【００２７】さらに、免震性の地盤改良体を造成する工
法の別の例として、上記のように地盤改良材のみの固結
物からなる地盤改良体の他に、地盤改良材と地盤とを混
合させて地盤改良体を造成する方法がある。この方法で
は、地盤に対して削孔を形成し、この削孔の周辺地盤へ
本発明による地盤改良体を浸透させて周辺地盤と混合さ
せ地盤改良体を造成する。Further, as another example of a construction method for forming a seismic isolation ground improvement body, in addition to the ground improvement body made of a solidified material of only the ground improvement material as described above, a ground improvement material and a ground may be used. There is a method of mixing to create a ground improvement body. In this method, a drilling hole is formed in the ground, and the ground improving body according to the present invention is permeated into the ground surrounding the drilling hole and mixed with the surrounding ground to form a ground improving body.
【００２８】尚、本発明において用いられる装置の具体
的構成は例示したものに限定されない。例えばロッド体
上の撹拌翼、掘削翼、及び吐出口の位置及び数等は様々
な設計態様が可能である。The specific configuration of the device used in the present invention is not limited to the illustrated one. For example, various design forms are possible for the position and number of the stirring blade, the excavating blade, and the discharge port on the rod body.
【００２９】図３（Ａ）は、本発明による免震性地盤改
良体造成工法の一施工例を示しており、地盤改良体と建
造物との関係を示す断面図である。図示のように地盤改
良体４２は、建造物７０の基礎８０を側方及び下方から
取囲むように地盤６０中に配置造成されている。また、
図３（Ｂ）は、別の施工例であり、地盤改良体４２が建
造物７０を直接的に取囲むように造成されている。FIG. 3A is a sectional view showing an example of a construction method of a seismic isolation ground improvement body construction method according to the present invention, and showing a relationship between the ground improvement body and a building. As shown in the figure, the ground improvement body 42 is arranged and constructed in the ground 60 so as to surround the foundation 80 of the building 70 from the sides and from below. Also,
FIG. 3B is another construction example, in which the ground improvement body 42 is constructed so as to directly surround the building 70.
【００３０】次に本発明による地盤改良材の配合内容と
特性との関係についての試験結果を示す。表１は、試験
に用いた試料の一覧表である。分散材としてゴム砕片を
用い、バインド材としてセメント及び水を用いた。Next, test results on the relationship between the content of the ground improvement material according to the present invention and the properties will be described. Table 1 is a list of samples used in the test. Rubber fragments were used as the dispersant and cement and water were used as the binder.
【００３１】[0031]
【表１】 地盤改良材の配合内容 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− 試料 ｜ゴム砕片粒径(mm)｜ゴム砕片 ｜ セメント ｜ 水 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ａ ｜ １．０〜４．５ ｜ ６００ ｜ ３００ ｜ ３００ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ｂ ｜ ０．７〜２．０ ｜ ６００ ｜ ３００ ｜ ３００ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ｃ ｜ ≦１．４ ｜ ６００ ｜ ３００ ｜ ３００ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− Ｄ ｜ ３．０〜９．０｜ ６００ ｜ ３００ ｜ ３００ −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− ＊ゴム砕片粒径は、上記の範囲に９０％以上含まれる。[Table 1] Composition of ground improvement material-----------------------------------------------------------| ) | Rubber debris | Cement | Water −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− A | 1.0-4.5 | 600 | 300 | 300 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− B B 0.7−2.0 | 600 600 300 | 300 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− C | ≦ 1.4 | 600 | 300 | 300 −−−−− −−−−−−−−−−−−−−−−−−−−−−−−−−− D D | 3.0 to 9.0 | 600 | 300 | 300 −−−−−−−− −−−−−−−−−−−−−−−−−−−−−−−−−− * Rubber particle size Includes more than 90% within the above range.
【００３２】図４に試料Ａ、Ｂ、Ｃ、及びＤを用いて試
験的に作製された地盤改良体の弾性変形特性を示す。こ
の図は、試料の当初の高さを１として、高さ方向に所定
の負荷を与えて試料を変形させたときの最大変位量と、
負荷を取り去ったときの復元量を示している。この結果
から、ゴム砕片、セメント、水の配合重量比が同じ場合
には、ゴム砕片の大きさが２．０ｍｍ以下のものが弾性
変形量及び復元性が最も良好であり、好適であることが
判明した。FIG. 4 shows the elastic deformation characteristics of the ground improvement body experimentally manufactured using the samples A, B, C, and D. This figure shows the maximum displacement when the sample is deformed by applying a predetermined load in the height direction, with the initial height of the sample being 1, and
The amount of restoration when the load is removed is shown. From this result, when the compounding weight ratio of rubber crushed pieces, cement and water is the same, those having a rubber crushed piece size of 2.0 mm or less have the best elastic deformation amount and resilience, and may be preferable. found.
【００３３】図５は、試料Ａ、Ｂ、Ｃ、及びＤの一軸圧
縮強度試験の結果を示すグラフである。縦軸は一軸圧縮
強度を、横軸は変位量を示す。Ｓはセメントのみの試料
であり、添え字ｆ付で示す点は各試料の変形量限界点を
示す。この試験結果からも試料Ｂが最も変形量が大き
く、強度もある程度大きく保持されていることが明らか
である。FIG. 5 is a graph showing the results of the uniaxial compressive strength tests of Samples A, B, C and D. The vertical axis represents the uniaxial compressive strength, and the horizontal axis represents the displacement amount. S is a sample of cement only, and the points with subscript f indicate the deformation limit points of each sample. From this test result, it is clear that the sample B has the largest amount of deformation and the strength is maintained to some extent.
【００３４】[0034]
【発明の効果】以上、本発明により、柔軟な構造をもつ
地盤改良体を造成するための地盤改良材及びその工法が
提供された。本発明を用いて造成された地盤改良体は、
低強度であるが弾性を有するので地中を伝搬する地震動
のエネルギーを吸収しまた減衰する免震効果を有する。
この免震性地盤改良体を、保護しようとする建造物の周
囲に適宜配置して造成すれば、その建造物に対する地震
動の衝撃を格段に低減することができる。これにより建
造物が地震から防護される。INDUSTRIAL APPLICABILITY As described above, the present invention provides a ground improvement material for constructing a ground improvement body having a flexible structure and a method of manufacturing the same. The ground improvement body created using the present invention,
Since it has low strength but elasticity, it has a seismic isolation effect that absorbs and attenuates the energy of the ground motion propagating in the ground.
If the seismic isolation ground improvement body is appropriately arranged around the building to be protected and constructed, the impact of the seismic motion on the building can be significantly reduced. This protects the building from earthquakes.
【００３５】また、本発明により造成される地盤改良体
は、大規模な施工範囲を必要とせず比較的集中して施工
することが可能であるので、施工場所の限られた既存の
建造物に対しても適用することができる。また、施工に
要する期間及び費用も少なくてすむという利点がある。Further, the ground improvement body constructed according to the present invention can be constructed relatively intensively without requiring a large-scale construction area, so that it can be applied to existing buildings with limited construction locations. It can also be applied to. Further, there is an advantage that the period and cost required for the construction can be reduced.
【００３６】尚、分散材として用いられるゴム砕片及び
合成樹脂砕片は、自動車等の廃材を利用することができ
るので非常に経済的であり、しかも、本発明におけるよ
うな土木工法においてはこのような廃材を大量に使用す
ることとなるので、廃棄物の安全な処理及び資源再利用
という面でも本発明は極めて有用である。Rubber crushed pieces and synthetic resin crushed pieces used as a dispersing material are very economical because waste materials of automobiles and the like can be used, and in the civil engineering method as in the present invention, such crushed rubber pieces and synthetic resin crushed pieces are used. Since a large amount of waste material is used, the present invention is extremely useful also in terms of safe disposal of waste and reuse of resources.
【図１】本発明による地盤改良材により造成された地盤
改良体の断面の様子を示す図である。FIG. 1 is a view showing a state of a cross section of a ground improvement body formed by a ground improvement material according to the present invention.
【図２】本発明による免震性地盤改良体造成工法を示
し、（Ａ）は施工開始前の装置の配置を、（Ｂ）は空洞
形成工程を、（Ｃ）は空洞形成完了時の状態を、（Ｄ）
は地盤改良材の吐出と共にロッド体の引き上げが終了し
た状態を示す。FIG. 2 shows a seismic isolation ground improvement body construction method according to the present invention, where (A) is the arrangement of devices before the start of construction, (B) is the cavity forming step, and (C) is the state when the cavity formation is completed. (D)
Indicates a state where the lifting of the rod body has been completed together with the discharge of the ground improvement material.
【図３】本発明による地盤改良材を用いて造成された地
盤改良体と建造物との関係の一例を示す図である。FIG. 3 is a diagram showing an example of a relationship between a ground improvement body formed using the ground improvement material according to the present invention and a building.
【図４】本発明による地盤改良材を用いた地盤改良体の
弾性変形特性を示すグラフである。FIG. 4 is a graph showing elastic deformation characteristics of a ground improvement body using the ground improvement material according to the present invention.
【図５】本発明による地盤改良材を用いた地盤改良体の
一軸圧縮強度試験の結果を示すグラフである。FIG. 5 is a graph showing the results of a uniaxial compressive strength test of a ground improvement body using the ground improvement material according to the present invention.
１２ ロッド体 １４ 撹拌翼 １６ 掘削翼 １８ モータ ２０ 駆動装置 ４２ 地盤改良体 ４４ ゴム砕片 ４６ バインド材 ５０ 空洞 ６０ 周辺地盤 Reference Signs List 12 rod body 14 stirring blade 16 excavating wing 18 motor 20 driving device 42 ground improvement body 44 rubber fragment 46 binding material 50 cavity 60 surrounding ground
───────────────────────────────────────────────────── フロントページの続き (72)発明者 関根 健 東京都港区新橋５丁目11番３号 東興建設 株式会社内 (72)発明者 池田 隆 千葉県千葉市稲毛区長沼町330番地 鬼怒 川ゴム工業株式会社内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ken Sekine 5-11-3 Shimbashi, Minato-ku, Tokyo Toko Construction Co., Ltd. (72) Inventor Takashi Ikeda 330 330 Naganuma-cho, Inage-ku, Chiba-shi Industry Co., Ltd.
Claims (9)
用する地盤改良材であって、少なくともゴム砕片を含む
分散材と、該分散材を分散させかつ固結させるバインド
材とを含むことを特徴とする地盤改良材。1. A ground improvement material used for constructing a seismic isolation ground improvement body, comprising a dispersion material containing at least rubber fragments and a binding material for dispersing and consolidating the dispersion material. Ground improvement material characterized by the following.
ことを特徴とする請求項１に記載の地盤改良材。2. The ground improvement material according to claim 1, wherein the dispersing material further includes crushed synthetic resin fragments.
の大きさが粒径０．５〜９．０ｍｍであることを特徴と
する請求項１又は２に記載の地盤改良材。3. The ground improvement material according to claim 1, wherein the dispersion material is formed by pulverization and has a particle size of 0.5 to 9.0 mm.
系硬化材のいずれかと水とを含むことを特徴とする請求
項１〜３のいずれかに記載の地盤改良材。4. The ground improvement material according to claim 1, wherein the binding material contains either cement or a cement-based hardening material and water.
含むことを特徴とする請求項４に記載の地盤改良材。5. The ground improvement material according to claim 4, wherein the binding material further contains soda silicate.
場合に、前記分散材と該セメントと該水との配合におけ
る重量比が１．０：０．３〜２．０：０．３〜２．０で
あることを特徴とする請求項４又は５に記載の地盤改良
材。6. When the binding material contains cement and water, the weight ratio of the dispersing material, the cement and the water in the mixture is 1.0: 0.3 to 2.0: 0.3 to 6.0. The ground improvement material according to claim 4, wherein the ground improvement material is 2.0.
とする請求項１〜３のいずれかに記載の地盤改良材。7. The ground improvement material according to claim 1, wherein the binding material contains a resin.
るロッド体を具備する地盤改良装置を用いて地盤に対し
て空洞を形成し、該空洞内に請求項１〜７のいずれかに
記載の地盤改良材を吐出充填することにより柔軟な地盤
改良体を造成することを特徴とする免震性地盤改良工
法。8. A cavity is formed in the ground using a ground improvement device having a rod having functions of excavation, stirring, and fluid discharge, and the cavity is formed in the cavity. A seismic isolation ground improvement method characterized in that a flexible ground improvement body is created by discharging and filling a ground improvement material.
るロッド体を具備する地盤改良装置を用いて地盤に対し
て削孔を形成し、該削孔の周辺地盤に対して請求項１〜
７のいずれかに記載の地盤改良材を浸透混合させること
により柔軟な地盤改良体を造成することを特徴とする免
震性地盤改良工法。9. A drill hole is formed in the ground by using a ground improvement device having a rod body having functions of excavation, stirring and fluid discharge, and the ground around the drilled hole is formed in the ground surrounding the hole.
7. A seismic isolation ground improvement method, characterized by forming a flexible ground improvement body by infiltrating and mixing the ground improvement material according to any one of 7 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17739496A JP3415363B2 (en) | 1996-06-18 | 1996-06-18 | Ground improvement material and seismic isolation ground improvement method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17739496A JP3415363B2 (en) | 1996-06-18 | 1996-06-18 | Ground improvement material and seismic isolation ground improvement method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH101940A true JPH101940A (en) | 1998-01-06 |
| JP3415363B2 JP3415363B2 (en) | 2003-06-09 |
Family
ID=16030172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17739496A Expired - Fee Related JP3415363B2 (en) | 1996-06-18 | 1996-06-18 | Ground improvement material and seismic isolation ground improvement method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3415363B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080636A (en) * | 1998-09-05 | 2000-03-21 | Hokuriku Ritoreddo Kk | Reinforced soil material and ground structure |
| JP2001049669A (en) * | 1999-08-09 | 2001-02-20 | Toko Corp | Lightweight banking material and construction method for lightweight ground |
| JP2001262143A (en) * | 2000-03-13 | 2001-09-26 | Hidetoshi Ochiai | Foundation improving material |
| KR20020024486A (en) * | 2000-09-25 | 2002-03-30 | 김상길 | A mothod of preparation for a coagulating soil and a coagulating soil thereby |
| JP2008031828A (en) * | 2006-07-05 | 2008-02-14 | Chem Grouting Co Ltd | Construction method of foundation of structure |
| JP2008231805A (en) * | 2007-03-22 | 2008-10-02 | Chem Grouting Co Ltd | Preparation construction method of building foundation |
| JP2009299397A (en) * | 2008-06-16 | 2009-12-24 | Asahi Kasei Construction Materials Co Ltd | Foundation structure and manufacturing method of foundation structure |
| JP2013217101A (en) * | 2012-04-09 | 2013-10-24 | Kumikawa Tekkosho:Kk | Quake absorbing pile installation mechanism |
| JP2020016038A (en) * | 2018-07-24 | 2020-01-30 | 積水化学工業株式会社 | Foundation structure for ground improvement |
| JP2021055300A (en) * | 2019-09-27 | 2021-04-08 | 有限会社久美川鉄工所 | Liquefaction countermeasure ground |
-
1996
- 1996-06-18 JP JP17739496A patent/JP3415363B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080636A (en) * | 1998-09-05 | 2000-03-21 | Hokuriku Ritoreddo Kk | Reinforced soil material and ground structure |
| JP2001049669A (en) * | 1999-08-09 | 2001-02-20 | Toko Corp | Lightweight banking material and construction method for lightweight ground |
| JP2001262143A (en) * | 2000-03-13 | 2001-09-26 | Hidetoshi Ochiai | Foundation improving material |
| KR20020024486A (en) * | 2000-09-25 | 2002-03-30 | 김상길 | A mothod of preparation for a coagulating soil and a coagulating soil thereby |
| JP2008031828A (en) * | 2006-07-05 | 2008-02-14 | Chem Grouting Co Ltd | Construction method of foundation of structure |
| JP2008231805A (en) * | 2007-03-22 | 2008-10-02 | Chem Grouting Co Ltd | Preparation construction method of building foundation |
| JP2009299397A (en) * | 2008-06-16 | 2009-12-24 | Asahi Kasei Construction Materials Co Ltd | Foundation structure and manufacturing method of foundation structure |
| JP2013217101A (en) * | 2012-04-09 | 2013-10-24 | Kumikawa Tekkosho:Kk | Quake absorbing pile installation mechanism |
| JP2020016038A (en) * | 2018-07-24 | 2020-01-30 | 積水化学工業株式会社 | Foundation structure for ground improvement |
| JP2021055300A (en) * | 2019-09-27 | 2021-04-08 | 有限会社久美川鉄工所 | Liquefaction countermeasure ground |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3415363B2 (en) | 2003-06-09 |
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